keyword
MENU ▼
Read by QxMD icon Read
search

Hydrothermal vent

keyword
https://www.readbyqxmd.com/read/28646448/purification-of-the-exopolysaccharide-produced-by-alteromonas-infernus-identification-of-endotoxins-and-effective-process-to-remove-them
#1
Alicia Grivaud-Le Du, Agata Zykwinska, Corinne Sinquin, Jacqueline Ratiskol, Pierre Weiss, Claire Vinatier, Jérôme Guicheux, Christine Delbarre-Ladrat, Sylvia Colliec-Jouault
Alteromonas infernus bacterium isolated from deep-sea hydrothermal vents can produce by fermentation a high molecular weight exopolysaccharide (EPS) called GY785. This EPS described as a new source of glycosaminoglycan-like molecule presents a great potential for pharmaceutical and biotechnological applications. However, this unusual EPS is secreted by a Gram-negative bacterium and can be therefore contaminated by endotoxins, in particular the lipopolysaccharides (LPS). Biochemical and chemical analyses of the LPS extracted from A...
June 23, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28603518/microbial-extracellular-polymeric-substances-epss-in-ocean-systems
#2
REVIEW
Alan W Decho, Tony Gutierrez
Microbial cells (i.e., bacteria, archaea, microeukaryotes) in oceans secrete a diverse array of large molecules, collectively called extracellular polymeric substances (EPSs) or simply exopolymers. These secretions facilitate attachment to surfaces that lead to the formation of structured 'biofilm' communities. In open-water environments, they also lead to formation of organic colloids, and larger aggregations of cells, called 'marine snow.' Secretion of EPS is now recognized as a fundamental microbial adaptation, occurring under many environmental conditions, and one that influences many ocean processes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28596393/genome-sequence-of-geothermobacter-sp-strain-epr-m-a-deep-sea-hydrothermal-vent-iron-reducer
#3
Benjamin Tully, Pratixaben Savalia, Karla Abuyen, Christina Baughan, Eric Romero, Cynthia Ronkowski, Brandon Torres, Jason Tremblay, Anthony Trujillo, Madeline Tyler, Ileana Pérez-Rodríguez, Jan Amend
Geothermobacter sp. strain EPR-M was isolated from a hydrothermal vent on the East Pacific Rise and has been shown to participate in the reduction of Fe(III) oxides. Here, we report its 3.73-Mb draft genome sequence.
June 8, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28586676/hydrothermal-vents
#4
William Brazelton
William Brazelton introduces deep sea hydrothermal vents and the unusual life forms they host.
June 5, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28558648/geographical-structure-of-endosymbiotic-bacteria-hosted-by-bathymodiolus-mussels-at-eastern-pacific-hydrothermal-vents
#5
Phuong-Thao Ho, Eunji Park, Soon Gyu Hong, Eun-Hye Kim, Kangchon Kim, Sook-Jin Jang, Robert C Vrijenhoek, Yong-Jin Won
BACKGROUND: Chemolithoautotrophic primary production sustains dense invertebrate communities at deep-sea hydrothermal vents and hydrocarbon seeps. Symbiotic bacteria that oxidize dissolved sulfur, methane, and hydrogen gases nourish bathymodiolin mussels that thrive in these environments worldwide. The mussel symbionts are newly acquired in each generation via infection by free-living forms. This study examined geographical subdivision of the thiotrophic endosymbionts hosted by Bathymodiolus mussels living along the eastern Pacific hydrothermal vents...
May 30, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28552991/exploring-the-molecular-basis-of-adaptive-evolution-in-hydrothermal-vent-crab-austinograea-alayseae-by-transcriptome-analysis
#6
Min Hui, Chengwen Song, Yuan Liu, Chaolun Li, Zhaoxia Cui
Elucidating the genetic mechanisms of adaptation to the hydrothermal vent in organisms at genomic level is significant for understanding the adaptive evolution process in the extreme environment. We performed RNA-seq on four different tissues of a vent crab species, Austinograea alayseae, producing 725,461 unigenes and 134,489 annotated genes. Genes related to sensory, circadian rhythm, hormone, hypoxia stress, metal detoxification and immunity were identified. It was noted that in the degenerated eyestalk, transcription of phototransduction related genes which are important for retinal function was greatly reduced; three crucial neuropeptide hormones, one molt-inhibiting and two crustacean hyperglycemic hormone precursors were characterized with conserved domains; hypoxia-inducible factor 1 and two novel isoforms of metallothioneins in the vent crabs were discovered...
2017: PloS One
https://www.readbyqxmd.com/read/28536498/catalytic-intermediate-crystal-structures-of-cysteine-desulfurase-from-the-archaeon-thermococcus-onnurineus-na1
#7
Thien-Hoang Ho, Kim-Hung Huynh, Diem Quynh Nguyen, Hyunjae Park, Kyoungho Jung, Bookyo Sur, Yeh-Jin Ahn, Sun-Shin Cha, Lin-Woo Kang
Thermococcus onnurineus NA1 is an anaerobic archaeon usually found in a deep-sea hydrothermal vent area, which can use elemental sulfur (S(0)) as a terminal electron acceptor for energy. Sulfur, essential to many biomolecules such as sulfur-containing amino acids and cofactors including iron-sulfur cluster, is usually mobilized from cysteine by the pyridoxal 5'-phosphate- (PLP-) dependent enzyme of cysteine desulfurase (CDS). We determined the crystal structures of CDS from Thermococcus onnurineus NA1 (ToCDS), which include native internal aldimine (NAT), gem-diamine (GD) with alanine, internal aldimine structure with existing alanine (IAA), and internal aldimine with persulfide-bound Cys356 (PSF) structures...
2017: Archaea: An International Microbiological Journal
https://www.readbyqxmd.com/read/28515421/comparative-transcriptome-analysis-of-rimicaris-sp-reveals-novel-molecular-features-associated-with-survival-in-deep-sea-hydrothermal-vent
#8
Jian Zhang, Qing-Lei Sun, Zhen-Dong Luan, Chao Lian, Li Sun
Shrimp of the family Alvinocarididae are the predominant megafauna of deep-sea hydrothermal vents. However, genome information on this family is currently unavailable. In the present study, by employing Illumina sequencing, we performed the first de novo transcriptome analysis of the gills of the shrimp Rimicaris sp. from the hydrothermal vent in Desmos, Manus Basin. The analysis was conducted in a comparative manner with the shrimp taken directly from the vent (GR samples) and the shrimp that had been maintained for ten days under normal laboratory condition (mGR samples)...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28509857/microbial-diversity-in-extreme-marine-habitats-and-their-biomolecules
#9
REVIEW
Annarita Poli, Ilaria Finore, Ida Romano, Alessia Gioiello, Licia Lama, Barbara Nicolaus
Extreme marine environments have been the subject of many studies and scientific publications. For many years, these environmental niches, which are characterized by high or low temperatures, high-pressure, low pH, high salt concentrations and also two or more extreme parameters in combination, have been thought to be incompatible to any life forms. Thanks to new technologies such as metagenomics, it is now possible to detect life in most extreme environments. Starting from the discovery of deep sea hydrothermal vents up to the study of marine biodiversity, new microorganisms have been identified, and their potential uses in several applied fields have been outlined...
May 16, 2017: Microorganisms
https://www.readbyqxmd.com/read/28503790/proton-gradients-at-the-origin-of-life
#10
REVIEW
Nick Lane
Chemiosmotic coupling - the harnessing of electrochemical ion gradients across membranes to drive metabolism - is as universally conserved as the genetic code. As argued previously in these pages, such deep conservation suggests that ion gradients arose early in evolution, and might have played a role in the origin of life. Alkaline hydrothermal vents harbour pH gradients of similar polarity and magnitude to those employed by modern cells, one of many properties that make them attractive models for life's origin...
June 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28493148/diversity-of-bacteria-and-archaea-from-two-shallow-marine-hydrothermal-vents-from-vulcano-island
#11
Garabed Antranikian, Marcel Suleiman, Christian Schäfers, Michael W W Adams, Simonetta Bartolucci, Jenny M Blamey, Nils-Kåre Birkeland, Elizaveta Bonch-Osmolovskaya, Milton S da Costa, Don Cowan, Michael Danson, Patrick Forterre, Robert Kelly, Yoshizumi Ishino, Jennifer Littlechild, Marco Moracci, Kenneth Noll, Tairo Oshima, Frank Robb, Mosè Rossi, Helena Santos, Peter Schönheit, Reinhard Sterner, Rudolf Thauer, Michael Thomm, Jürgen Wiegel, Karl Otto Stetter
To obtain new insights into community compositions of hyperthermophilic microorganisms, defined as having optimal growth temperatures of 80 °C and above, sediment and water samples were taken from two shallow marine hydrothermal vents (I and II) with temperatures of 100 °C at Vulcano Island, Italy. A combinatorial approach of denaturant gradient gel electrophoresis (DGGE) and metagenomic sequencing was used for microbial community analyses of the samples. In addition, enrichment cultures, growing anaerobically on selected polysaccharides such as starch and cellulose, were also analyzed by the combinatorial approach...
July 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28493048/a-novel-%C3%AF-3-desaturase-in-the-deep-sea-giant-tubeworm-riftia-pachyptila
#12
Helu Liu, Hui Wang, Shanya Cai, Haibin Zhang
One paradox of the trophic biochemistry of the deep sea giant tubeworm Riftia pachyptila, endemic to hydrothermal vent sites and nourished by polyunsaturated fatty acid (PUFA) deficiency chemolitoautotrophic sulfide-oxidizing bacteria, is the source of their PUFAs. Biosynthesis of PUFA starts with two precursors C18:2n-6 and C18:3n-3, which cannot be biosynthesized by most animals due to lack of ω6- and ω3-desaturase; thus, C18:2n-6 and C18:3n-3 are generally essential fatty acids for animals. Here, we characterized a gene derived from the R...
May 10, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28488795/the-novel-bacterial-phylum-calditrichaeota-is-diverse-widespread-and-abundant-in-marine-sediments-and-has-the-capacity-to-degrade-detrital-proteins
#13
Ian P G Marshall, Piotr Starnawski, Carina Cupit, Eva Fernández Cáceres, Thijs J G Ettema, Andreas Schramm, Kasper U Kjeldsen
Calditrichaeota is a recently recognised bacterial phylum with three cultured representatives, isolated from hydrothermal vents. Here we expand the phylogeny and ecology of this novel phylum with metagenome-derived and single-cell genomes from six uncultivated bacteria previously not recognised as members of Calditrichaeota. Using 16S rRNA gene sequences from these genomes, we then identified 322 16S rRNA gene sequences from cultivation-independent studies that can now be classified as Calditrichaeota for the first time...
May 10, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28487755/conjecture-and-hypothesis-the-importance-of-reality-checks
#14
David Deamer
In origins of life research, it is important to understand the difference between conjecture and hypothesis. This commentary explores the difference and recommends alternative hypotheses as a way to advance our understanding of how life can begin on the Earth and other habitable planets. As an example of how this approach can be used, two conditions have been proposed for sites conducive to the origin of life: hydrothermal vents in salty seawater, and fresh water hydrothermal fields associated with volcanic landmasses...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28487161/resilience-of-benthic-deep-sea-fauna-to-mining-activities
#15
REVIEW
Sabine Gollner, Stefanie Kaiser, Lena Menzel, Daniel O B Jones, Alastair Brown, Nelia C Mestre, Dick van Oevelen, Lenaick Menot, Ana Colaço, Miquel Canals, Daphne Cuvelier, Jennifer M Durden, Andrey Gebruk, Great A Egho, Matthias Haeckel, Yann Marcon, Lisa Mevenkamp, Telmo Morato, Christopher K Pham, Autun Purser, Anna Sanchez-Vidal, Ann Vanreusel, Annemiek Vink, Pedro Martinez Arbizu
With increasing demand for mineral resources, extraction of polymetallic sulphides at hydrothermal vents, cobalt-rich ferromanganese crusts at seamounts, and polymetallic nodules on abyssal plains may be imminent. Here, we shortly introduce ecosystem characteristics of mining areas, report on recent mining developments, and identify potential stress and disturbances created by mining. We analyze species' potential resistance to future mining and perform meta-analyses on population density and diversity recovery after disturbances most similar to mining: volcanic eruptions at vents, fisheries on seamounts, and experiments that mimic nodule mining on abyssal plains...
April 13, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28486437/earliest-signs-of-life-on-land-preserved-in-ca-3-5-ga-hot-spring-deposits
#16
Tara Djokic, Martin J Van Kranendonk, Kathleen A Campbell, Malcolm R Walter, Colin R Ward
The ca. 3.48 Ga Dresser Formation, Pilbara Craton, Western Australia, is well known for hosting some of Earth's earliest convincing evidence of life (stromatolites, fractionated sulfur/carbon isotopes, microfossils) within a dynamic, low-eruptive volcanic caldera affected by voluminous hydrothermal fluid circulation. However, missing from the caldera model were surface manifestations of the volcanic-hydrothermal system (hot springs, geysers) and their unequivocal link with life. Here we present new discoveries of hot spring deposits including geyserite, sinter terracettes and mineralized remnants of hot spring pools/vents, all of which preserve a suite of microbial biosignatures indicative of the earliest life on land...
May 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28484604/cutting-through-the-smoke-the-diversity-of-microorganisms-in-deep-sea-hydrothermal-plumes
#17
Anni Djurhuus, Svein-Ole Mikalsen, Helge-Ansgar Giebel, Alex D Rogers
There are still notable gaps regarding the detailed distribution of microorganisms between and within insular habitats such as deep-sea hydrothermal vents. This study investigates the community composition of black smoker vent microorganisms in the Southern Hemisphere, and changes thereof along a spatial and chemical gradient ranging from the vent plume to surrounding waters. We sampled two hydrothermal vent fields, one at the South West Indian Ridge (SWIR), the other at the East Scotia Ridge (ESR). Samples were collected across vent fields at varying vertical distances from the origin of the plumes...
April 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28484442/relative-importance-of-chemoautotrophy-for-primary-production-in-a-light-exposed-marine-shallow-hydrothermal-system
#18
Gonzalo V Gomez-Saez, Petra Pop Ristova, Stefan M Sievert, Marcus Elvert, Kai-Uwe Hinrichs, Solveig I Bühring
The unique geochemistry of marine shallow-water hydrothermal systems promotes the establishment of diverse microbial communities with a range of metabolic pathways. In contrast to deep-sea vents, shallow-water vents not only support chemosynthesis, but also phototrophic primary production due to the availability of light. However, comprehensive studies targeting the predominant biogeochemical processes are rare, and consequently a holistic understanding of the functioning of these ecosystems is currently lacking...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28484436/comparative-genomic-analysis-of-the-class-epsilonproteobacteria-and-proposed-reclassification-to-epsilonbacteraeota-phyl-nov
#19
David W Waite, Inka Vanwonterghem, Christian Rinke, Donovan H Parks, Ying Zhang, Ken Takai, Stefan M Sievert, Jörg Simon, Barbara J Campbell, Thomas E Hanson, Tanja Woyke, Martin G Klotz, Philip Hugenholtz
The Epsilonproteobacteria is the fifth validly described class of the phylum Proteobacteria, known primarily for clinical relevance and for chemolithotrophy in various terrestrial and marine environments, including deep-sea hydrothermal vents. As 16S rRNA gene repositories have expanded and protein marker analysis become more common, the phylogenetic placement of this class has become less certain. A number of recent analyses of the bacterial tree of life using both 16S rRNA and concatenated marker gene analyses have failed to recover the Epsilonproteobacteria as monophyletic with all other classes of Proteobacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28470848/iron-catalysis-at-the-origin-of-life
#20
Eloi Camprubi, Sean F Jordan, Rafaela Vasiliadou, Nick Lane
Iron-sulphur proteins are ancient and drive fundamental processes in cells, notably electron transfer and CO2 fixation. Iron-sulphur minerals with equivalent structures could have played a key role in the origin of life. However, the 'iron-sulphur world' hypothesis has had a mixed reception, with questions raised especially about the feasibility of a pyrites-pulled reverse Krebs cycle. Phylogenetics suggests that the earliest cells drove carbon and energy metabolism via the acetyl CoA pathway, which is also replete in Fe(Ni)S proteins...
May 3, 2017: IUBMB Life
keyword
keyword
17089
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"